Pipe still furnace structure



pril 7, 1942.- D. G. BRAND-r g 2,27992 PIPE STILL FURNACE STRUCTURE Filed Dec. 14, 1938 2 Sheets-Sheet 1 INVENTOR /ls// 6'. lz Afm" ATTORNEY April 7, 1942. D, G, BRAND-1- l 2,279,192

PIPE STILL FURNAC STRUCTURE Filed Deo. 14, 1958 2 Sheets-Sheet 2 INVENTOR. I ,Z2/Ww 6. 5l /Vr ATTORNEY riasaxpaaissz' y :siam

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Citieaserviceii N. I., assigner to cmpany,NewY N.Y., amrationofrennsylvania on'.

Application-*December misas, sei-u No. uam

ZCIaIm.

This invention relates .to improvements in the structure of pipe still furnaces, and more particularly to pipe stills or tubular heaters used' years in the processing of petroleum, and these furnaces usually comprise a rather massive structure, sometimes including both outslde'and inside walls as well es supporting structure for the tubes which makeup the coils for heating f the oil. The inside walls or lining structure of these furnaces also usually include rather thick -iire brick for the protection of any steel reinforcing or outsidebrick construction. Pipe still furnaces used for the conversion of hydrocarbons into motor fuel constituents often include from 4000 to 0000 feet of heavy tubing'which must be supported by the furnace structure.

The primary object of thepresent invention is to provide a pipe still furnace adapted to per form the/'usual functions for which pipe still furnaces' are used, and at the same time comprise a. relatively light structure which is easily assembled.

A further object of the invention is to provide l furnace improvement of the present invention will be apparent to those skilled in the art from the following more detailed description thereof taken in connection with theaccompanying drawings in which:

Fig. 1 is a broken vertical sectional view of a portion of a pipe still furnace constructedin accordance with the features of the present invention.

Fig. 2 is a vertical sectional view of the portion of the pipe still furnace shown in Fig. 1 taken on the line 2 2.

Fig. 8 is e. horizontal sectional view showing a broken portion of the structure of Fig. l taken on the line @-8. Y

ripe still furnaces have been used for many'- (Cl. 12H1.)

Fig. 4 is a perspective view of one of the porous insulating re brick used in the wall structures shown in Pigs. l and 2.

Fig. 5 is a perspective view of a different formV s'of porous insulating fire brick used in the roof construction as shown in Fig. 2. and also in a modified wall structure as shown in Fig. 8.

F1316 is a view similar to that of Fig.2 showing a modified formof side wall construction.

Fig. 'I is an enlarged broken vertical sectional view showing certain details of the side wall construction illustrated in-Fig. 6.

Fig. 8 is a broken horizontal sectional view "showing amodiiled form of side wall construc'` tion in which the fire brick shown in Fig. 5 are employed.

Fig. 9 is a perspective view of one of the side wall plate and hanger elements shown inFigs. l and 2.

Fig. l0 is a perspective view of the side wall panel and attached flange-like hangers such as that used in the wall ,construction shown in F18. 8.

The pipe still furnace constructed in accordance with the preferred form of 'the invention as shown in Figs. 1 and 2 of the drawings com prises a side wall structure preferably made up of a plurality of panels which are readily assembled. In Fig. l each panel comprises a plurality of horizontal plates 2 shown in perspective in Fig. 9. These plates are mounted in vertical..

series and attached to vertical channel irons by bolting, riveting or welding. The wall of the furnace may be comprised of a pluralityof panel sections each of which will consist of a plurality of the plates 2. the ends of which are attached to vertical channel irons Adjacent channel irons of the assembled panels are in turn attached to each other back to back by bolting or by other suitable method of attachmen (See Fig. 3.)

The side wall plates 2 as shown in Fig. 9 include a small right angle flange member and a ange-like bracket 8 comprising an initial 90 horizontal section and an upturned section bent at about 30 to the horizontal. These plates are assempled as shown in Figs. l, 2 and 3, to form the panels of the outside wall of the furnace.

The remainder of the side wall of the furnace comprises next about 2 vof .85% magnesia insulation Il mounted immediately on the inside of the plates 2 between the brackets 3, and nally a nre brick lining 4% thick, composed of rows of 're brick I2 hung on Ithe brackets 8 and two rows oi' lire brick keys it resting on each row of or after being set in place, the magnesia insulation preferably in slab form is set against the plates and then the rows of re brick I2 are placed on the bracket hangers 8. Each of the f brick I2 is provided with a slot I6 (Fig. 4) which is deeper than the projection of the bracket 8 beyond the magnesia, so that the brick I2 will rest against the magnesia rather than against the edge of the bracket 8, as shown in enlarged detail in Fig. '7. After the rows of flre brick I2 are in place the small key brick I4 are simply laid on top of the rows of brick vI2 to fill the intermediate spaces. Two rows of key brick are preferably used in order to facilitate the removal of any row or part of a row of re brick I2 for purposes of repair or replacement.

VFrom the description of the side walls shown in Figs. l, 2 and 3 given above, it is apparent that the side wall of the furnace may be readily assembled as well as readily repaired or replaced in any detail. For example, an Ventire panel of the side wall may be removed and replaced without disturbing the remainder of the wallor a side wall plate 2 may be removed bysimply removing two sets of keys I4 and two rows of re brick I2. It is furthermore apparent that the smallest unit in the wall structure may be repaired or replaced without the necessity of disturbing any of the remainder of the wall.

, 'I'he pipe still furnace as shown in Figures 1 to 3 preferably comprises a roof structure also made up of panels comprising channel irons I8 to which is attached a steel plate 28 which in turn supports attached hanger brackets 22. The

remainder of the roof comprises a layer of magnesia insulation 24 between the brackets 22 and i'lre brick 26 supported on the brackets as shown. 'I'he fire brick 26 are shown in enlarged detail in Fig. 5 and each includes a pair of converging slots28. The brackets 22 extend lengthwise of the roof panels and entirely across the furnace. After the insulation 24 is in place, the iire brick 26 are simply slid onto the -end of the brackets until the rows of the fire brick completely cover the inside of the roof of the furnace. It will be noted as shown in Fig. 2, the brackets 22 are bent similar to the side wall brackets 8, but that except for the outside brackets of a panel, they are constructed in duplicate forni.' It will also be noted that two bracket hangers are required to support a single row of the re brick 28. The roof panels may be assembled, including brick, on the ground, reverse side up, and then set in place.

The roof of the furnace is supported by the channel irons I8 which are in turn supported by the vertical channel irons 4, by any suitable method of attachment such as by bolting, riveting or welding; The furnace of the present invention however is preferably bolted together so that any sections may be readily removed for repair of the internal structure such as bridge walls and heating tubes. A vfurnace of this type may also be taken down and assembled in a different location without material damage to any portion of the structure..

Provision is made in the pipe still furnace ,structure shown in Figs. 1 to 3 for suitably securing the usual tube sheets or tube supports used in the pipe still furnace. For example, the roof tubes 28 may be supported at intermediate points in holes cut through depending sheets of steel such as the sheet which extends between two rows of re brick 26 and in fact is mounted between two of the roof panels, so that the sheet 38 is attached directly between the backs of two adjacent channel irons I8, as shown in Fig. 2. Such a tube support may be inserted between all adjacent roof panels.

The furnace shown in Figs. 1 to 3, may also be provided with a tube bank comprising a plurality of tubes 32.-mounted at the side of the. furnace, back of a bridge wall 84. The tubes of such a tube bank always require intermediate supports, since they are usually from 20 to 30 feet in length, and in the present instance, such supports 36 are provided. Each of the supports 30 comprises a steel plate provided with holes for each of the tubes 32, as shown in Fig. l. Each of the plates 36 as shown in Fig. 3 is mounted between adjacent side wall panels. so that -it extends between the iire brick and insulation of the adjacent panels, and is secured between the vertical channel irons 4. The opposite side of the plate 38 extends into and is attached to the supporting structure of the bridge wall 84. i The modified form of construction shown in Fig. 6 diil'ers only from that shown in Figs. 1 and 2, in that the side wall panel is made up of a steel plate or plates 40 which is secured to the vertical channels 4 in the same manner as in Figs..1 and 3. vIn Fig. 6 the hangers for the ilre brick I2 comprise horizontal flanges 42 which are welded or riveted to the plate 48. A portion of' the4 panel plate 48, and attached hangers or brackets 42, is shown in perspective in Fig. 10. It will be noted that each of the brackets 42 is provided with a vertical angle section 44 to increase its strength and to facilitate its attachment to the plate 40. 'I'his structure and relationship is shown in enlarged detail in Fig. 7 which also shows the relationship of the sizes of the slot I6 in the re brick I2 to the hanger bracket 42. The longer slot permits the nre brick I2 to rest directly against the insulation I8.

The panel 40 as shown in Fig. 10 represents.

alform of panel used as the end or corner panel of the furnace'wall, since at the left-the hanger brackets 42 do not extend entirely to the edge of the panel plate 48 where they would otherwise interfere with the, brackets of the adjacent panel, h

tween the brackets which are welded or other# wise attached to theplates 46, and then the iire brick 26 are slid down lover the brackets from above to build up columns of iire brick to completely line the inside of the wall. Small ilre brick 62 of the key type referred to above may be t 2,279,192 used to ll any odd spaces such as that in the supported on any wall or other part of the structure without altering the invention, as defined by the appended claims. A single row of tubes for example may be supported on all of the side walls by means of supports such as 30, shown in Figs. l and 2, mounted between the side wall panels in the manner shown in Figs. 2 and 3.

The panel type of construction not only provides a relatively light furnace, but one in which the furnace gases cannot pass 'through the walls or roof.as in certain brick constructions. Furthermore, air cannot enter the furnace except through the usual air ducts for the burners.

While the improved furnace wall structure of the present invention has been described in connection with its use in pipe still furnaces, it is to be understoodY that the same wall structure may be used for other furnaces and heaters such for example as metal treating furnaces, tubular boilers, steam plants, and other furnaces.

Having thus described the invention,v what is claimed as new is:l

30 I. In a pipe still furnace for heating uids, an

improved side-wall structure comprising a plurality of vertically Vextending side-wall panels each comprising a sheet metal backing attached to rigid outside vertical supporting members, adjacent panels being joined together by attaching a vertical supporting member on the side 'of one panel to the adjacent vertical supporting member on the side of the adjoining panel. a tube sheet secured between the vertical supporting members of two adjacent panels and extending therefrom into the furnace chamber, the portion of said tube sheet extending into the furnace chamber being provided with holes for tubes,r

and tubes for heating uidsvmounted in the holes of said tube sheet.

2. In a pipe still furnace for heating fluids, an" l improved Wall structure comprising a plurality of Wall panels each including a sheet metal back'L ing having two opposite edges attached to rigid outside supporting members, adjacent panels being joined together by attaching a supporting member on the side of one panel to the adjacent supporting member on the side of the adjoining panel, a tube sheet secured between the rigid outside supporting members of two adjacent panels and extending therefrom into the furnace chamber, the portion of said tube sheetextending into the furnace chamber being provided with holes for tubes, and tubes for heating fluids mounted in the holes of said tube sheet.

DAVID G. BRANDT. 

